[Tunas73TA]

oops

[Tunas73TA]

Originally Posted by 666 the legend

..Thanks steve..SENDER is now installed...Now? I noticed in this pic? to the left there is a WIRE mounted to the head..?? Is that a ground coming from that same ALT harness..??

I've got that same shot. Almost

Notice my Negative battery terminal stud has been "put out to pasture"

[Peter Serio]

The autozone sender is made by Wells; it is part # TU5.

Another one I have had good luck with is sold by CarQuest. It is part # 53-7719.

In my tests both of the above senders were very, very close to the old AC Delco # 1513321.


In a case where you have a laser gun and your gauge still reads 7 to 10 degrees hotter on the dial than actual, (and you have tried one or the other of the 2 above senders) try a Sorensen TSU5.



WARNING: STAY AWAY from both GM #12334869 AND NAPA # TS6469SB. Both of these have low resistance and will cause your dash display to read anywhere from 10 to 20 degrees higher indicated temps than actual. (Verify with a laser gun.)

Originally Posted by 666 the legend

Just curious?? iwas on e-bay and found this TEMP SEND that said it was for cars with GAUGES ONLY and is good for 70-78..? or somethin like that..Will this work..If not..Whats the one at AUTOZONE you were talkin bout..?? Part #..?? or just ask the idiots behind the counter for TEMP SEND for a 72 Pontiac..??

[71 T/A]

On ebay, a seller's car fitmet chart says the Wells TU5 won't work on 70s Firebirds with guages. Sure looks like the right part, though.

Originally Posted by Peter Serio

The autozone sender is made by Wells; it is part # TU5.

Another one I have had good luck with is sold by CarQuest. It is part # 53-7719.

In my tests both of the above senders were very, very close to the old AC Delco # 1513321.


In a case where you have a laser gun and your gauge still reads 7 to 10 degrees hotter on the dial than actual, (and you have tried one or the other of the 2 above senders) try a Sorensen TSU5.



WARNING: STAY AWAY from both GM #12334869 AND NAPA # TS6469SB. Both of these have low resistance and will cause your dash display to read anywhere from 10 to 20 degrees higher indicated temps than actual. (Verify with a laser gun.)

[njsteve]

Originally Posted by 71 T/A

On ebay, a seller's car fitmet chart says the Wells TU5 won't work on 70s Firebirds with guages. Sure looks like the right part, though.

He's wrong.

Here is my original testing in the old thread. You can see the Wells TU5 was the closest specs to the original, old sending unit.

http://forums.maxperformanceinc.com/...=632070&page=2

[Formulabruce]

Originally Posted by njsteve

He's wrong.

Here is my original testing in the old thread. You can see the Wells TU5 was the closest specs to the original, old sending unit.

http://forums.maxperformanceinc.com/...=632070&page=2

Steve is correct, I have now tested a TU 5 with a 1970 set of gauges, and a 72, its very close.

[70RAlll]

I have 3 original ones that look as good as you will find. All have the AC Delco upside down.. ANyone want one just PM me, beats the heck out of a repo one..

[Formulabruce]

Played with a TU-5 last week with a stock 70 gauge set. Mine was close, but not perfect, so being old and anal, I tried for more LOL. I wanted to see what "actually" happened to accuracy with a added resistor in line. So I calculated what I needed and had a friend put it way back at firewall. I noticed it nailed the operating temp, which was 180 water with a 160 T-stat,( and im sure well over 200 in the cylinders for those with efficiency in mind).
SO we changed out a few and it changed the gauge reading. I then hooked it to the TU 5 in hot water ( pan of water with jumper wires) to the gauges in the car. ran the water to 200, and got 200 on the gauge, 210 seemed right on..tried 150, was very close...Now I wondered why all the hype on other forums about it being not accurate.
The temp gauge itself has a resistor to make it compatible with the senders used at the time. So I figure why would an additional one make it not accurate at any other temps> and why would they say its accurate for the TEMP you make it but not others?
This info is FALSE. That said..The difference was this, the reaction speed was slowed a bit, across the board. going up and down.
Technically mine should have been as close as Steve's, BUT old "wound" resistors on back of a gauge can loose their insulation and some of their resisting properties making gauges read higher. The right way may have been to bench test the whole thing and make the total "back of gauge" resistance match with the sender resistance for accuracy. May have to do that someday..
so Im running a 20 ohm resistor... hehe

[FirebirdScar]

Originally Posted by Formulabruce

Played with a TU-5 last week with a stock 70 gauge set. Mine was close, but not perfect, so being old and anal, I tried for more LOL. I wanted to see what "actually" happened to accuracy with a added resistor in line. So I calculated what I needed and had a friend put it way back at firewall. I noticed it nailed the operating temp, which was 180 water with a 160 T-stat,( and im sure well over 200 in the cylinders for those with efficiency in mind).
SO we changed out a few and it changed the gauge reading. I then hooked it to the TU 5 in hot water ( pan of water with jumper wires) to the gauges in the car. ran the water to 200, and got 200 on the gauge, 210 seemed right on..tried 150, was very close...Now I wondered why all the hype on other forums about it being not accurate.
The temp gauge itself has a resistor to make it compatible with the senders used at the time. So I figure why would an additional one make it not accurate at any other temps> and why would they say its accurate for the TEMP you make it but not others?
This info is FALSE. That said..The difference was this, the reaction speed was slowed a bit, across the board. going up and down.
Technically mine should have been as close as Steve's, BUT old "wound" resistors on back of a gauge can loose their insulation and some of their resisting properties making gauges read higher. The right way may have been to bench test the whole thing and make the total "back of gauge" resistance match with the sender resistance for accuracy. May have to do that someday..
so Im running a 20 ohm resistor... hehe

Congratulations on the success. I would recommend you use a precision resistor, they don't vary as much to ambient temperature. A standard carbon film or wire wound, will vary as much as 10% with 100 deg temperature swing. Just a suggestion, again great work.

[Formulabruce]

Originally Posted by FirebirdScar

Congratulations on the success. I would recommend you use a precision resistor, they don't vary as much to ambient temperature. A standard carbon film or wire wound, will vary as much as 10% with 100 deg temperature swing. Just a suggestion, again great work.

I did use a 1/2 watt 5% resistor,its not near the engine, so will be testing it as time goes by, probably more next summer. Thanks!!

[71pp'sGP]

Originally Posted by Tunas73TA

I've got that same shot. Almost

Notice my Negative battery terminal stud has been "put out to pasture"

on my engine i dont see a temp sending unit on the engine head as your pic shows, the only one a have is on the intake its a 3 prong...

[67 Lamnas]

Originally Posted by 71pp'sGP

on my engine i dont see a temp sending unit on the engine head as your pic shows, the only one a have is on the intake its a 3 prong...

'72-later were in the cylinder head, '71-earlier mounted in the intake.

[Formulabruce]

[70RAlll]

Guys..I have one more original used Temp Sending unit I will sell.On the other thread,3 prong sender, I posted that I had some of these. Really beats adding resistors,cuting into the harness etc.. Just seemed to me a bit much when GM used this sending unit on many Pontiacs in the early 70's-they are not that difficult to find..
Anyway, I sold a number to others and will sell one more.. $25 plus shipping $7. I think I am being quite fair with this price.. Just shoot me a PM and I'll respond within a day or two. Pls do not PM me if you already have one and just want an extra one for $25....Let's let this go to a board member who doesn't have one and needs the correct unit.. This is a really nice unit.. Hare to tell it is almost 45 years old..